Features

Every feature listed here ships in the product today. No roadmap items, no “coming soon”.

Supported Payment Methods

Gateway	Chip / PIN	NFC / Tap	QR Code	Manual
Visa / Mastercard
WeChat Pay
Alipay
UnionPay
CentraPay
EFTPOS
Cash

Multi-Gateway Payments

Accept payments from all major providers in a single terminal.

Card (Visa / Mastercard) — chip, PIN, contactless (tap-to-pay)
WeChat Pay — QR code scanning
Alipay — QR code scanning
UnionPay — QR code scanning
CentraPay — wallet payments
EFTPOS — debit card processing
Cash — recording for reconciliation

Tap-to-Pay NFC

One-tap card detection via Sunmi PaySDK or Android NFC adapter.

Instant handoff to the Skyzer payment SDK for EMV processing
Tip & fee summary dialog shown before charging
Configurable idle re-enable watchdog for reliable detection
Automatic pause during standby mode to save battery
Apple Pay, Google Pay, and physical contactless cards

Smart Payment Routing

Automatic fallback to the next available provider on retriable failures.

Each provider declares its capabilities
The router selects the best match for every transaction
Retry with next provider on timeout or soft-decline
Configurable gateway ordering per terminal

Tipping & Fees

Flexible tipping presets and per-gateway surcharge control.

Preset percentages — configurable chips (e.g. 10%, 15%, 20%)
Custom amount — operator enters an arbitrary tip value
No Tip — one-tap skip
Global surcharge percentage across all gateways
Per-gateway fee overrides (e.g. Visa 1.5%, Alipay 0%)
Server can lock fee settings to prevent local modification

Reports & Settlement

Real-time transaction reporting with end-of-day batch settlement.

Filterable transaction log with search
Per-gateway channel summary
Overall revenue summary
Settlement reports (end-of-day batching)
Detailed view: amounts, fees, tips, auth codes, masked card numbers, timestamps

Receipts & Printing

Sunmi built-in, network, and Bluetooth thermal printers.

Structured merchant receipts (header, amounts, totals, auth codes)
QR codes and barcodes on receipts
Auto-print after successful payment (optional)
Configurable paper width (58 mm / 80 mm)
ESC/POS protocol over Wi-Fi TCP or Bluetooth

Multi-Terminal Networking

LAN discovery, WebSocket push, and POS Controller mode.

Automatic terminal discovery via UDP broadcast + NSD
Inter-terminal payment and refund commands over LAN
HMAC-signed requests with timestamp validation (anti-replay)
STOMP over secure WebSocket for real-time server push
POS Controller mode: terminal as peripheral, amount locked by master POS

Server-Driven Configuration

Two-layer config model — root defaults + per-terminal overrides.

Root config from the public /endPoints API (system-wide defaults)
Terminal override from the authenticated /terminal/info API (sparse, per-device)
Deep-merge: terminal values override root, unset fields inherit root
Server pushes FORCE_REFRESH via WebSocket for instant config updates
Configurable: gateways, tips, fees, standby, timezone, feature flags, timeouts

Over-the-Air Updates

Self-updating without an app store. SHA-256 verified. Presigned S3 URLs.

Fetches manifest from GET /api/v1/app/manifest?flavor=payus
Compares versionCode against installed build
Streams APK to disk with progress bar — never loads into memory
SHA-256 hash verification before installing
Presigned S3 URLs expire after 1 hour
Mandatory flag forces update before terminal can be used

Enterprise Security

Root detection, encrypted storage, JWT + HMAC auth, environment segregation.

Root and jailbreak detection on every cold start
AES-256-GCM encrypted storage (Android EncryptedSharedPreferences)
JWT Bearer tokens for all API calls
OAuth 2.0 Client Credentials flow for token refresh
HMAC signing for LAN inter-terminal commands
Switching environments clears all auth data — prevents credential leaks

Security at every layer

AES-256-GCMEncrypted Storage

JWT + OAuth 2.0Token Auth

HMAC-SHA256Request Signing

Root DetectionDevice Integrity